The new mom showed off her slim post-baby body as she ran errands in Los Angeles on Tuesday, less than a month after giving birth to daughter Vivienne.
The 38-year-old actress looked cute and casual in a plaid button down, black leggings and slip-on sneakers.
Larter welcomed her second child with husband Hayes MacArthur on January 15, announcing the happy news on her website.
"It's a girl!" she wrote in a post, which included the first photo of her little one bundled up in a blanket. "We couldn't be more excited to share news of the arrival of Vivienne Margaret MacArthur on Thursday January 15th 2015."
Baby Vivienne joins her 4-year-old brother Theodore, who Larter included as part of her newborn's birth announcement. "She came bearing gifts for her brother," the "Diabolical" star wrote. "Batman sheets and lots of Gummy Bears!!! 7.5 lbs of love."
Motherhood looks good on her, right?!
Click "Launch Gallery" at the top to see more celebrity post-baby bods, before and after.